C++ program to check whether a number is prime number or not.
C++ Program to check Prime number
#include<iostream>
using namespace std;
int main() {
int num, i, isPrime=0;
cout << "Enter a Positive Integer\n";
cin >> num;
// Check whether num is divisible by any number between 2 to (num/2)
for(i = 2; i <=(num/2); ++i) {
if(num%i==0) {
isPrime=1;
break;
}
}
if(isPrime==0)
cout << num << " is a Prime Number";
else
cout << num << " is not a Prime Number";
return 0;
}
Output
Enter a Positive Integer 23 23 is a Prime Number
Enter a Positive Integer 21 21 is not a Prime Number
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